Identify the correct order of the size of the following:

• Ca²⁺ < K⁺<Ar < S^2- < Cl^-

• Ca²⁺ < K⁺ < Ar < Cl^-< S^2-

• Ar < Ca²⁺ <K⁺ <Cl^- <S^2-

• Ar < Ca²⁺ <K⁺ <Cl^- <S^2-

In which of the following pairs, the two species are isostructural?

• SF₄ and XeF₄

• SO₃^2- and NO₃^-

• BF₃ and NF₃

• BF₃ and NF₃

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is:

• BeCO₃ < MgCO₃ < K₂CO₃ <CaCO₃

• BeCO₃ < MgCO₃ < CaCO₃ <K₂CO₃

• MgCO₃ < BeCO₃ < CaCO₃ < K₂CO₃

• MgCO₃ < BeCO₃ < CaCO₃ < K₂CO₃

In which of the following the hydration energy is higher than the lattice energy? 

• BaSO₄

• MgSO₄

• RaSO₄

• RaSO₄

Which of the following will give a pair of enantiomorphs?
(en = NH₂CH₂CH₂NH₂)

• [Co(NH₃)Cl₂]NO₂

• [Cr(NH₃)₆]Co(CN)₆]

• [Co(en)₂Cl₂]Cl

• [Co(en)₂Cl₂]Cl

The Number of moles of KMnO₄  that will be needed to react with one mole of sulphite ion in acidic solution is:

• 3/5

• 4/5

• 2/5

• 1

17.

Identify the incorrect statement among the following:

• There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

• Lanthanoid contraction is the accumulation of successive shrinkages

• As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements

• As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements

If there is no rotation of plane polarises light by a compound in a specific solvent, thought to by chiral, it may mean that:

• the compound is certainly a chiral

• the compound is certainly meso

• there is no compound in the solvent

• there is no compound in the solvent

Which one of the following ions is the most stable in aqueous solution?

• Cr³⁺

• V³⁺

• Ti³⁺

• Ti³⁺

Concentrated aqueous sulphuric acid is 98% H₂SO₄by mass and has a  density of 1.80 g mL^-1.Volume of acid required to make one litre of 0.1 M H₂SO₄ solution is:

• 11.10 mL

• 16.65 mL

• 22.20 mL

• 22.20 mL